fix: properly act like a cargo subcommand

Cargo.lock

@@ -160,6 +160,7 @@ version = "0.1.1"
 dependencies = [
  "axum",
  "clap",
+ "clap-cargo",
  "include_dir",
  "serde",
  "serde_json",
@@ -183,6 +184,16 @@ dependencies = [
  "clap_derive",
 ]
 
+[[package]]
+name = "clap-cargo"
+version = "0.15.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d546f0e84ff2bfa4da1ce9b54be42285767ba39c688572ca32412a09a73851e5"
+dependencies = [
+ "anstyle",
+ "clap",
+]
+
 [[package]]
 name = "clap_builder"
 version = "4.5.38"

Cargo.toml

@@ -11,6 +11,7 @@ include = ["/public", "/src"]
 [dependencies]
 axum = { version = "0.8.4", features = ["macros"] }
 clap = { version = "4.5.38", features = ["derive"] }
+clap-cargo = "0.15.2"
 include_dir = "0.7.4"
 serde = { version = "1.0.219", features = ["derive"] }
 serde_json = "1.0.140"

src/main.rs

@@ -5,15 +5,32 @@ use tokio::runtime::Builder;
 
 mod server;
 
+pub const CLAP_STYLING: clap::builder::styling::Styles = clap::builder::styling::Styles::styled()
+    .header(clap_cargo::style::HEADER)
+    .usage(clap_cargo::style::USAGE)
+    .literal(clap_cargo::style::LITERAL)
+    .placeholder(clap_cargo::style::PLACEHOLDER)
+    .error(clap_cargo::style::ERROR)
+    .valid(clap_cargo::style::VALID)
+    .invalid(clap_cargo::style::INVALID);
+
 #[derive(Parser, Debug)]
-#[command(version)]
+#[command(name = "cargo")]
+#[command(bin_name = "cargo")]
+#[command(styles = CLAP_STYLING)]
+enum Cli {
+    Spiel(CliArgs),
+}
+
+#[derive(clap::Args, Debug)]
+#[command(version, about, long_about = None)]
 struct CliArgs {
     /// Directory of the Cargo project
     pub project: Option<PathBuf>,
 }
 
 fn main() {
-    let args = CliArgs::parse();
+    let Cli::Spiel(args) = Cli::parse();
     let runtime = Builder::new_current_thread()
         .worker_threads(2)
         .enable_io()